Can you still claim an all-electric car is "zero emission" if the electricity used to charge-up it's battery is coming [in part] from a fossil-fuelled [or nuclear] power station?
When I raced high-performance two-stroke bikes back in the late 70's and 80's I recall that unleaded petrol became the norm and getting the old 4-star leaded fuel was a challenge as it was no longer available from mainstream service stations.
To avoid piston detonation [and other expensive...